A few days ago he actually did retire (well, was retired) but he's got plenty of energy left in him, and also more than 35 years of IT experience. So how, specifically, would one go about determining the best project to dedicate one's effort to?
He's a civil engineer, has done a ton of wizardy mainframe programming "back in the day", and has spent the last 15-20 years doing product presentations and educating the sales force about the technical side of the product lines. He's an avid promoter of "green" technology (that is, energy-efficiency and recyclability), and has never been afraid to go against management if he had a better plan. However, he's not entirely up to speed on the open source movement and free operating systems, though I do my best to educate him.
I'm sure he would make an excellent spokesperson for the OpenMoko, except they don't have any openings. So where else could you suggest, where would you start looking?